(WIP) feat: improve error handling with contextual error messages

[Mubashwer]

Description

Improve error handling with contextual error messages

• Migrate from Box<dyn Error> to anyhow for better error handling
• Add contextual error messages throughout the codebase using anyhow::Context
• Use bail! macro for cleaner error creation
• Provide more helpful error messages for git command failures
• Add specific context for team member and mob session operations
• Update test expectations to match new error message format

Users now get more informative error messages with context about what operation failed and why.

• Bug fix
• New feature
• Breaking change
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes.

Checklist

• My code is formatted with rustfmt
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas N/A
• I have made corresponding changes to the documentation N/A
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit and integration tests pass locally with my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.80%. Comparing base (1981ee7) to head (d0f0913).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   98.43%   98.80%   +0.36%     
==========================================
  Files           8        8              
  Lines         320      334      +14     
==========================================
+ Hits          315      330      +15     
+ Misses          5        4       -1     

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